Control of Sooty Blotch and Flyspeck - Auburn University Repository
Control of Sooty Blotch and Flyspeck - Auburn University Repository
Control of Sooty Blotch and Flyspeck - Auburn University Repository
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A ,<br />
Appearance <strong>of</strong> this apple with its many pin point spots is typical <strong>of</strong> fruit infected<br />
with sooty blotch disease.<br />
the second (11,12) to fourth (7,13) cov er spray, <strong>and</strong> continue un<br />
til harx est. Timing fungicide applications according to such<br />
schedules does not appear to coincide 'a ith development <strong>of</strong> the<br />
diseases in Alabama. Both fungi are activ e during humid, cool<br />
spring weather, but may be entirely albsent during hot, dry, sum<br />
iner weather (2). In Alabama, control <strong>of</strong> sooty blotch <strong>and</strong> flyspeck<br />
was poor with a dodiiie + ferlbani Ilossom spr ay followed by<br />
folpet cover sprays, or a season long aplplication <strong>of</strong> metiram,<br />
mancozeb + dinocap, thiram + folpet, dithianon, or with thiophanate<br />
methyl (9).<br />
The purpose <strong>of</strong> this investigation was to obtain effective control<br />
<strong>of</strong> sooty blotch <strong>and</strong> flyspeck on apples by improving the<br />
tining <strong>of</strong> fungicidal appjlications in Alabama.<br />
MATERIALS AND METHODS<br />
In 197 1, the seasonal development <strong>of</strong> sooty blotclh <strong>and</strong> flyspeck<br />
was investigated on imature Richared Red l)elicious apples at the<br />
North labanma llorticutilture Substation, Cullman. A 1-quart<br />
plastic bag was placed over apple blossolls or fruit clusters, with<br />
only a few attached leaves included, <strong>and</strong> tied to tihe twig. Tile<br />
lbag was cut i inch deep) at righlt angles to te bottom, to release<br />
wvater condlensate. On \April 9, 15, <strong>and</strong> 23, a total <strong>of</strong> 260 blossoms<br />
was b~agged on each <strong>of</strong> six trees. Tile Ilossoms had browned<br />
stamens <strong>and</strong> pistils, indicating pollination polobably had occuired.<br />
Bagging continued on April 30 <strong>and</strong> Mlay 7, with 60 ap~ple clusters